High Precision Timing Belt Pulleys
High Precision Timing Belt Pulleys
Texas Belting supplies precision-machined timing belt pulleys manufactured specifically for polyurethane timing belts. Every pulley is produced to tight tolerances for smooth, accurate operation and maximum belt service life. Available in aluminum, steel, stainless steel, and Delrin with normal, reduced, or zero backlash tooth gaps and a full range of customization options including custom bores, keyways, finishes, and mounting configurations.
For standard off-the-shelf pulleys in common sizes, see stock pulleys. For self-tracking belt applications, pulleys with K6 or K13 grooves are available. For tensioners, clamps, and mounting hardware, see the accessories page.
- Materials: aluminum, steel, stainless steel, Delrin
- Backlash: normal, reduced (SE), zero (0)
- Precision TIR: 0.025mm pitch diameter, 0.015mm bore
- 6 surface finish options
- Custom bore, keyway, and hub configurations
- Flanged, unflanged, and self-tracking groove options
- Compatible with all T, AT, ATP, HTD, STD profiles
- Taper-Lock and QD bushing mounting available
Backlash Control Options
The tooth gap between belt and pulley determines the amount of play (backlash) in the drive. Tighter gaps improve positioning accuracy but require more precise alignment.
| Design | Code | Description | Application |
|---|---|---|---|
| Normal backlash | (standard) | Standard tooth gap, default if not specified | General-purpose drives, conveying |
| Reduced backlash | SE | Tighter tooth gap, less play | Precision positioning, improved repeatability |
| Zero backlash | 0 | Minimum gap, virtually no play | Highest-precision linear drives, servo systems, CNC machines |
Pulley Materials
| Code | Material | Properties | Best For |
|---|---|---|---|
| AL | Aluminum | Lightweight, cost-effective, easy to machine | Standard for most applications, stock pulleys |
| VA | Stainless steel | Corrosion resistant, high power capacity | Food-grade, pharmaceutical, washdown |
| ST | Steel | Highest power, most abrasion resistant | Heavy-duty drives, high torque, abrasive environments |
| POM | Delrin (acetal) | Non-metallic, chemical resistant, quiet | Electronics, cleanroom, non-magnetic required |
Surface Finishes
| Finish | Applied To | Properties |
|---|---|---|
| Anodizing (clear, black, or color) | Aluminum | Corrosion protection, aesthetic finish |
| Hard anodizing | Aluminum | Increased surface hardness for abrasive environments |
| Black oxide | Steel | Corrosion protection, low-reflectivity finish |
| Zinc plating | Steel | Increased corrosion resistance |
| Chromate conversion | Steel | Chemical and corrosion resistance |
| Nickel plating | Steel | Enhanced chemical and corrosion resistance |
Customization Options
Every pulley can be customized to exact specifications. Available modifications include: flanged or unflanged configurations, custom bore sizes with keyway, bolt hole patterns, counterbored mounting holes, lightening holes for weight reduction, set screw hubs, snap ring grooves, Taper-Lock bushing mounting, QD bushing mounting, self-tracking guide grooves (K6 and K13), and custom hub dimensions.
Belt Width to Pulley Face Width Reference
The pulley face must be wider than the belt to allow proper belt tracking. The table below shows recommended face widths for flanged and self-tracking pulleys.
| Belt Width (mm) | Flanged Pulley Face (mm) | Self-Tracking Pulley Face (mm) |
|---|---|---|
| 10 | 16 | N/A |
| 16 | 22 | 21 |
| 25 | 32 | 30 |
| 32 | 40 | 37 |
| 50 | 60 | 55 |
| 75 | 85 | 80 |
| 100 | 110 | 105 |
| 150 | 160 | 155 |
Frequently Asked Questions
Aluminum (AL) is the standard choice for most applications. It is lightweight, cost-effective, and easy to machine. Use stainless steel (VA) for food-grade or corrosive environments. Steel (ST) is best for the highest power and abrasion resistance. Delrin (POM) is ideal for non-metallic, chemical-resistant, or low-noise requirements such as electronics handling.
Normal backlash pulleys have a standard tooth gap that allows easy belt engagement and is sufficient for most power transmission and conveying applications. Reduced backlash (SE) pulleys have a tighter gap for improved positioning repeatability. Zero backlash (0) pulleys have the minimum possible gap, virtually eliminating play for the highest positioning accuracy in linear drives, CNC machines, and servo systems. Tighter gaps require more precise shaft alignment.
Aluminum pulleys are lighter and more cost-effective for most applications. Choose steel when operating at very high torque, when the pulley must withstand heavy side loading, or when the drive environment involves high temperatures or abrasive contaminants that would wear aluminum faster. For high-speed applications, aluminum's lower weight reduces inertia and allows faster acceleration.
Precision-ground pulleys hold total indicated runout (TIR) of 0.025mm or better on the pitch diameter and 0.015mm on the bore. Standard machined pulleys hold approximately 0.05mm TIR. Precision pulleys are recommended for high-speed drives and critical positioning applications where runout would cause vibration or positioning error.
Pilot bore pulleys have an undersized center hole that must be machined to your exact shaft diameter with keyway. Finished bore pulleys are pre-machined to a standard shaft size with keyway and set screw, ready to install. Pilot bore offers more flexibility for non-standard shafts. Finished bore offers faster installation. Stock pulleys are typically available in both configurations.
Larger pulleys (more teeth) provide smoother belt engagement, reduced belt stress, and lower noise. Smaller pulleys (fewer teeth) allow more compact drives but increase belt flex stress and may generate more noise. Never go below the minimum tooth count specified for your belt pitch. For minimum tooth counts by profile, see the specifications reference.
Yes. Pulleys can be manufactured with Taper-Lock or QD bushing hubs for easy installation and removal without disturbing shaft alignment. This is recommended for applications requiring frequent pulley changes or where precise shaft positioning must be maintained during maintenance. Contact Texas Belting at 888-203-2358 for bushing-mount pulley options.
Standard aluminum pulleys in common tooth counts are typically available from stock or within 1 to 2 weeks. Custom materials, finishes, bore sizes, or special configurations may require 2 to 4 weeks. Stainless steel and Delrin pulleys are typically made to order. Contact Texas Belting at 888-203-2358 for current lead times on your specific configuration.
Need Custom Timing Belt Pulleys?
Send us your profile, tooth count, bore size, material, and any special requirements. We will provide a quote for precision-machined pulleys to your specifications.